How about d+B 2x, b+B > HD > close C, b+B, d~u+K, HDC b~f+K, d~u+K, HDC b~f+K, SC Thermidor
I'm not sure about button strengths yet.
Could be possible except that first d~u+D would have to be B version. Not sure if you would use a HDC midscreen and end it early by using qcfx2+P.
Edit: Best thing I could find on this is (corner) j.C -> s.C -> b,f+K -> qcb+AC -> qcfx2+P but this doesn't work mid-screen
Could be possible, I tried all the special attacks with super cancelling except qcb, doesn't work. Even if it does I think it would be only useful if there's a way to do it midscreen so it'll do more hits. I'd love to find out if there is a way to do it!
On a side note, I read up on Ash a bit yesterday and tried out some stuff.
He can do this combo in the corner
1 power gauge
1 power gauge - 0 Drive Gauge
Edit: j.C -> s.C -> b,f+BD -> b,f+C -> b+D -> b,f+C (need to hold forward for a split second to move closer)
Instead a slightly easier combo is:
1 power gauge - 0 Drive Gauge
j.C -> s.C -> b,f+BD -> b,f+C -> b+D -> dash b+D -> dash CD (43%)
I think I read that you can actually add another b,f+C after the b+D or b,f+A, but you have to do some sort of trick to make him walk forward a step while you do b,f+C. Might be back then hold forward a little, then C. It might be that you can shorten how far back the b+D goes. Gotta try this further
Also you can start an HD combo like this in the corner:
j.C -> s.C -> b,f+BD -> b,f+C -> b+D -> BC -> b,f+C -> HDC stuff
This means that you can actually do a combo starting with ABCD, when it ends you can cancel a b+D into HD combo.
After all this practicing I'm starting to think it's too much effort and practice to be worth the time.
Edit: Found out today that the easiest way to do a (near) full screen combo starting with Sans is to do this:
d,u+B -> d,u+B -> DC b,f+D (miss) -> d,u+b -> d,u+B -> b+D -> b,f+D -> continue